Idea: option to couple `git commit` from CLI

It would be handy to have an option to tack a `git commit` command along with the `cl` command, using the same message.  

For example, right now you might manually do the following:

```
changelog new "add new feature x"
git commit -m "add new feature x"
```

With an optional flag, you could do both with one command:

```
changelog --git added "add new feature x"
```